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The hierarchical degree-of-visibility tree

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3 Author(s)
Lidan Shou ; Handsome Int. Software Co. Ltd, Hangzhou, China ; Zhiyong Huang ; Tan, K.-L.

In this paper, we present a novel structure called the hierarchical degree-of-visibility tree (HDoV-tree) for visibility query processing in visualization systems. The HDoV-tree builds on and extends the R-tree such that 1) the search space is pruned based on the degree of visibility of objects and 2) internal nodes store level-of-details (LoDs) that represent a collection of objects in a coarser form. We propose two tree traversal algorithms that balance performance and visual fidelity, explore three storage structures for the HDoV-tree, and develop novel caching techniques for disk-based HDoV-tree. We implemented the HDoV-tree in a prototype walkthrough system called VISUAL. Our experimental study shows that VISUAL can lead to high frame rates without compromising visual fidelity.

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:16 ,  Issue: 11 )